Flacke Luis, Liensberger Lukas, Althammer Matthias, Huebl Hans, Geprägs Stephan, Schultheiss Katrin, Buzdakov Aleksandr, Hula Tobias, Schultheiss Helmut, Edwards Eric R J, Nembach Hans T, Shaw Justin M, Gross Rudolf, Weiler Mathias
Walther-Meißner Institute, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.
Physics Department, Technical University of Munich, 85748 Garching, Germany.
Appl Phys Lett. 2019;115(12). doi: https://doi.org/10.1063/1.5102132.
We report ultralow intrinsic magnetic damping in CoFe heterostructures, reaching the low 10 regime at room temperature. By using a broadband ferromagnetic resonance technique in out-of-plane geometry, we extracted the dynamic magnetic properties of several CoFebased heterostructures with varying ferromagnetic layer thicknesses. By measuring radiative damping and spin pumping effects, we found the intrinsic damping of a 26 nm thick sample to be ≲ 3.18 × 10. Furthermore, using Brillouin light scattering microscopy, we measured spin-wave propagation lengths of up to (21 ± 1) m in a 26 nm thick CoFe heterostructure at room temperature, which is in excellent agreement with the measured damping.
我们报道了CoFe异质结构中的超低本征磁阻尼，在室温下达到了10的较低水平。通过在面外几何结构中使用宽带铁磁共振技术，我们提取了几种具有不同铁磁层厚度的CoFe基异质结构的动态磁性能。通过测量辐射阻尼和自旋泵浦效应，我们发现一个26纳米厚的样品的本征阻尼约为≲3.18×10。此外，使用布里渊光散射显微镜，我们在室温下测量了一个26纳米厚的CoFe异质结构中自旋波传播长度高达(21±1)米，这与测量的阻尼非常吻合。
